#app3 {
}
#app3 .square {
  border: 1px solid grey;
  margin-top: 10vw;
  margin-left: 10vw;
  width: 10vw;
  height: 10vw;
  transition: all 1s;
}
#app3 .square.active {
  transform: translateX(15vw);
}
